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Linux/drivers/pci/hotplug/pciehp_core.c

  1 /*
  2  * PCI Express Hot Plug Controller Driver
  3  *
  4  * Copyright (C) 1995,2001 Compaq Computer Corporation
  5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
  6  * Copyright (C) 2001 IBM Corp.
  7  * Copyright (C) 2003-2004 Intel Corporation
  8  *
  9  * All rights reserved.
 10  *
 11  * This program is free software; you can redistribute it and/or modify
 12  * it under the terms of the GNU General Public License as published by
 13  * the Free Software Foundation; either version 2 of the License, or (at
 14  * your option) any later version.
 15  *
 16  * This program is distributed in the hope that it will be useful, but
 17  * WITHOUT ANY WARRANTY; without even the implied warranty of
 18  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 19  * NON INFRINGEMENT.  See the GNU General Public License for more
 20  * details.
 21  *
 22  * You should have received a copy of the GNU General Public License
 23  * along with this program; if not, write to the Free Software
 24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 25  *
 26  * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
 27  *
 28  */
 29 
 30 #include <linux/moduleparam.h>
 31 #include <linux/kernel.h>
 32 #include <linux/slab.h>
 33 #include <linux/types.h>
 34 #include <linux/pci.h>
 35 #include "pciehp.h"
 36 #include <linux/interrupt.h>
 37 #include <linux/time.h>
 38 
 39 /* Global variables */
 40 bool pciehp_debug;
 41 bool pciehp_poll_mode;
 42 int pciehp_poll_time;
 43 static bool pciehp_force;
 44 
 45 #define DRIVER_VERSION  "0.4"
 46 #define DRIVER_AUTHOR   "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
 47 #define DRIVER_DESC     "PCI Express Hot Plug Controller Driver"
 48 
 49 /*
 50  * not really modular, but the easiest way to keep compat with existing
 51  * bootargs behaviour is to continue using module_param here.
 52  */
 53 module_param(pciehp_debug, bool, 0644);
 54 module_param(pciehp_poll_mode, bool, 0644);
 55 module_param(pciehp_poll_time, int, 0644);
 56 module_param(pciehp_force, bool, 0644);
 57 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
 58 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
 59 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
 60 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if OSHP is missing");
 61 
 62 #define PCIE_MODULE_NAME "pciehp"
 63 
 64 static int set_attention_status(struct hotplug_slot *slot, u8 value);
 65 static int enable_slot(struct hotplug_slot *slot);
 66 static int disable_slot(struct hotplug_slot *slot);
 67 static int get_power_status(struct hotplug_slot *slot, u8 *value);
 68 static int get_attention_status(struct hotplug_slot *slot, u8 *value);
 69 static int get_latch_status(struct hotplug_slot *slot, u8 *value);
 70 static int get_adapter_status(struct hotplug_slot *slot, u8 *value);
 71 static int reset_slot(struct hotplug_slot *slot, int probe);
 72 
 73 /**
 74  * release_slot - free up the memory used by a slot
 75  * @hotplug_slot: slot to free
 76  */
 77 static void release_slot(struct hotplug_slot *hotplug_slot)
 78 {
 79         kfree(hotplug_slot->ops);
 80         kfree(hotplug_slot->info);
 81         kfree(hotplug_slot);
 82 }
 83 
 84 static int init_slot(struct controller *ctrl)
 85 {
 86         struct slot *slot = ctrl->slot;
 87         struct hotplug_slot *hotplug = NULL;
 88         struct hotplug_slot_info *info = NULL;
 89         struct hotplug_slot_ops *ops = NULL;
 90         char name[SLOT_NAME_SIZE];
 91         int retval = -ENOMEM;
 92 
 93         hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL);
 94         if (!hotplug)
 95                 goto out;
 96 
 97         info = kzalloc(sizeof(*info), GFP_KERNEL);
 98         if (!info)
 99                 goto out;
100 
101         /* Setup hotplug slot ops */
102         ops = kzalloc(sizeof(*ops), GFP_KERNEL);
103         if (!ops)
104                 goto out;
105 
106         ops->enable_slot = enable_slot;
107         ops->disable_slot = disable_slot;
108         ops->get_power_status = get_power_status;
109         ops->get_adapter_status = get_adapter_status;
110         ops->reset_slot = reset_slot;
111         if (MRL_SENS(ctrl))
112                 ops->get_latch_status = get_latch_status;
113         if (ATTN_LED(ctrl)) {
114                 ops->get_attention_status = get_attention_status;
115                 ops->set_attention_status = set_attention_status;
116         } else if (ctrl->pcie->port->hotplug_user_indicators) {
117                 ops->get_attention_status = pciehp_get_raw_indicator_status;
118                 ops->set_attention_status = pciehp_set_raw_indicator_status;
119         }
120 
121         /* register this slot with the hotplug pci core */
122         hotplug->info = info;
123         hotplug->private = slot;
124         hotplug->release = &release_slot;
125         hotplug->ops = ops;
126         slot->hotplug_slot = hotplug;
127         snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl));
128 
129         retval = pci_hp_register(hotplug,
130                                  ctrl->pcie->port->subordinate, 0, name);
131         if (retval)
132                 ctrl_err(ctrl, "pci_hp_register failed: error %d\n", retval);
133 out:
134         if (retval) {
135                 kfree(ops);
136                 kfree(info);
137                 kfree(hotplug);
138         }
139         return retval;
140 }
141 
142 static void cleanup_slot(struct controller *ctrl)
143 {
144         pci_hp_deregister(ctrl->slot->hotplug_slot);
145 }
146 
147 /*
148  * set_attention_status - Turns the Amber LED for a slot on, off or blink
149  */
150 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
151 {
152         struct slot *slot = hotplug_slot->private;
153 
154         pciehp_set_attention_status(slot, status);
155         return 0;
156 }
157 
158 
159 static int enable_slot(struct hotplug_slot *hotplug_slot)
160 {
161         struct slot *slot = hotplug_slot->private;
162 
163         return pciehp_sysfs_enable_slot(slot);
164 }
165 
166 
167 static int disable_slot(struct hotplug_slot *hotplug_slot)
168 {
169         struct slot *slot = hotplug_slot->private;
170 
171         return pciehp_sysfs_disable_slot(slot);
172 }
173 
174 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
175 {
176         struct slot *slot = hotplug_slot->private;
177 
178         pciehp_get_power_status(slot, value);
179         return 0;
180 }
181 
182 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
183 {
184         struct slot *slot = hotplug_slot->private;
185 
186         pciehp_get_attention_status(slot, value);
187         return 0;
188 }
189 
190 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
191 {
192         struct slot *slot = hotplug_slot->private;
193 
194         pciehp_get_latch_status(slot, value);
195         return 0;
196 }
197 
198 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
199 {
200         struct slot *slot = hotplug_slot->private;
201 
202         pciehp_get_adapter_status(slot, value);
203         return 0;
204 }
205 
206 static int reset_slot(struct hotplug_slot *hotplug_slot, int probe)
207 {
208         struct slot *slot = hotplug_slot->private;
209 
210         return pciehp_reset_slot(slot, probe);
211 }
212 
213 static int pciehp_probe(struct pcie_device *dev)
214 {
215         int rc;
216         struct controller *ctrl;
217         struct slot *slot;
218         u8 occupied, poweron;
219 
220         /* If this is not a "hotplug" service, we have no business here. */
221         if (dev->service != PCIE_PORT_SERVICE_HP)
222                 return -ENODEV;
223 
224         if (!dev->port->subordinate) {
225                 /* Can happen if we run out of bus numbers during probe */
226                 dev_err(&dev->device,
227                         "Hotplug bridge without secondary bus, ignoring\n");
228                 return -ENODEV;
229         }
230 
231         ctrl = pcie_init(dev);
232         if (!ctrl) {
233                 dev_err(&dev->device, "Controller initialization failed\n");
234                 return -ENODEV;
235         }
236         set_service_data(dev, ctrl);
237 
238         /* Setup the slot information structures */
239         rc = init_slot(ctrl);
240         if (rc) {
241                 if (rc == -EBUSY)
242                         ctrl_warn(ctrl, "Slot already registered by another hotplug driver\n");
243                 else
244                         ctrl_err(ctrl, "Slot initialization failed (%d)\n", rc);
245                 goto err_out_release_ctlr;
246         }
247 
248         /* Enable events after we have setup the data structures */
249         rc = pcie_init_notification(ctrl);
250         if (rc) {
251                 ctrl_err(ctrl, "Notification initialization failed (%d)\n", rc);
252                 goto err_out_free_ctrl_slot;
253         }
254 
255         /* Check if slot is occupied */
256         slot = ctrl->slot;
257         pciehp_get_adapter_status(slot, &occupied);
258         pciehp_get_power_status(slot, &poweron);
259         if (occupied && pciehp_force) {
260                 mutex_lock(&slot->hotplug_lock);
261                 pciehp_enable_slot(slot);
262                 mutex_unlock(&slot->hotplug_lock);
263         }
264         /* If empty slot's power status is on, turn power off */
265         if (!occupied && poweron && POWER_CTRL(ctrl))
266                 pciehp_power_off_slot(slot);
267 
268         return 0;
269 
270 err_out_free_ctrl_slot:
271         cleanup_slot(ctrl);
272 err_out_release_ctlr:
273         pciehp_release_ctrl(ctrl);
274         return -ENODEV;
275 }
276 
277 static void pciehp_remove(struct pcie_device *dev)
278 {
279         struct controller *ctrl = get_service_data(dev);
280 
281         cleanup_slot(ctrl);
282         pciehp_release_ctrl(ctrl);
283 }
284 
285 #ifdef CONFIG_PM
286 static int pciehp_suspend(struct pcie_device *dev)
287 {
288         return 0;
289 }
290 
291 static int pciehp_resume(struct pcie_device *dev)
292 {
293         struct controller *ctrl;
294         struct slot *slot;
295         u8 status;
296 
297         ctrl = get_service_data(dev);
298 
299         /* reinitialize the chipset's event detection logic */
300         pcie_enable_notification(ctrl);
301 
302         slot = ctrl->slot;
303 
304         /* Check if slot is occupied */
305         pciehp_get_adapter_status(slot, &status);
306         mutex_lock(&slot->hotplug_lock);
307         if (status)
308                 pciehp_enable_slot(slot);
309         else
310                 pciehp_disable_slot(slot);
311         mutex_unlock(&slot->hotplug_lock);
312         return 0;
313 }
314 #endif /* PM */
315 
316 static struct pcie_port_service_driver hpdriver_portdrv = {
317         .name           = PCIE_MODULE_NAME,
318         .port_type      = PCIE_ANY_PORT,
319         .service        = PCIE_PORT_SERVICE_HP,
320 
321         .probe          = pciehp_probe,
322         .remove         = pciehp_remove,
323 
324 #ifdef  CONFIG_PM
325         .suspend        = pciehp_suspend,
326         .resume         = pciehp_resume,
327 #endif  /* PM */
328 };
329 
330 static int __init pcied_init(void)
331 {
332         int retval = 0;
333 
334         retval = pcie_port_service_register(&hpdriver_portdrv);
335         dbg("pcie_port_service_register = %d\n", retval);
336         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
337         if (retval)
338                 dbg("Failure to register service\n");
339 
340         return retval;
341 }
342 device_initcall(pcied_init);
343 

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